Controller for shoe machinery.



V. HOFFMAN. CONTROLLER FOR SHOE MACHINERY.

APPLIGATION FILED JULY 31, 1911. r

3 SHEETS-15331 1.

Patented July 14, 1914.

THE NORRIS PETERS C(l. PNOTO-LITHQ. WASHINGTON. D. 1

V. HOFFMAN.

CONTROLLER FOB. SHOE MACHINERY.

APPLICATION FILED JULY 31, 1911.

1,103,204. Patented July 14, 1914,

3 SHEETSSHEET 2.

THE NUKRIS PETERS CO. PHOTO-LlTI-Kl, WASHINGTON, D- C V. HOFFMAN.

CONTROLLER FOR SHOE MACHINERY.

APPLICATION PILED JULY 31, 1911. 1 103,204. Patented July 14, 1914. v 3SHEETSSHEET 3.

HI-I NORRIS PETbKa CD. PHOTO-LITHQ. WASHINGTON. I"

' tion.

rinrrnn s'rn'rns PATENT o'nrion.

VALENTINE HOFFMAN, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-FOURTH IO SELZSCHWAB 8c COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CONTROLLER FOR SHOE MACHINERY.

Specification of Letters Patent.

Patented July re, 1914..

Application filed July 31, 1911. Serial No. 641,447.

To all whom it may concern Be it known that I, VALENTINE HOFFMAN, acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Controllers for Shoe Machinery, of which the following is aspecification, reference being had therein to the accompanying drawing.

My invention relates to controllers for shoe machinery; its primaryobject is to provide an automatic starter requiring for its operationpressure by the operator in carrying on his work as in crowding thematerial on the last, and its secondary object is to provide anautomatic stop-device.

The invention consists in the matters hereinafter described and thenpointed out in the claims.

In the accompanying drawing which illustrates a practical embodiment ofmy invention :-Figure 1 is a front view of a tacking machine embodyingmy invention; Fig. 2 is a side View of the same; Fig. 3 is a side viewof parts of the mechanism on a larger scale; Fig. dis a top plan view ofparts shown in Fig. 3; Fig. 5 is a detail cross-sectional view on theline 5-5 of Fig. 3; Fig. 6 is a detail side view of parts of Fig. 3 intheir second positions; Fig. 7 is a view partly in section and partly infront elevation of parts shown in Fig. 6; Fig. 8 is cross-sectional viewpartly in elevation of certain parts shown in Fig. 6, and Figs. 9 and 10are detail views of a form of clutch conveniently employed.

In the drawings the numeral 20 represents a suitable column upon which atable 21 is supported. The table is provided with any suitable tackermechanism; in the pres ent embodiment a tacker and joiner for the innerseam between the uppers and welts of shoes is shown, it being understoodthat the mechanism of the shoe-machinery may be varied without departingfrom my inven- In the form shown the table carries a head or upright 22having a forwardly projecting arm 23 which is provided at its front endwith a laterally projecting wing 2a, to support certain parts of theshoemechanism.

A drive shaft 25 is journaled in suitable bearings 26 on brackets 27 andis provided with a loose drive pulley 28 to which power is applied fromany suitable source. The

shaft 25 carries a sheave 29 near one end from which a belt transmitsmotion to a wheel 31'of a tack-hopper 32 mounted on a stud in the end ofthe lateral arm. 2a feeding the tacks in any suitable manner nowwell-known in the art to a race-way 40 on the front end of the arm 23;its lower end carries a driver ll moving in the nozzle 36, and its upperend is connected to the forwardly projecting arm &2 of a bell- .crankdriving-lever pivoted at 43 to a bracket on the head and having aleverspring 414: wound under tension on its pivot and bearing upon thearm 42 as shown in Fig. 2. The free end 4C5 of the driving leverprojects into the path of a cam 4C6 on the shaft 25 whose movement putsthe lever-spring under tension to operate the driving-lever when the campasses out of engagement with the latter; normally the free end of arm45 rests in a depression 46 in the cam. The shaft 25 carries aneccentric 4:7 and an eccentric strap 48 which operate a separator 49 forthe tacks in a manner now well understood in the art. The shaft 25 andthe driving pulley 28 may be coupled by any suitable clutch; the one nowabout to be described is typical in this respect and has beenpractically used. The

shaft 25 carries a clutch-hub 5O keyed greater diameter than the depthof the channels or thickness of the sleeve 54: and normallyrest inrecesses or grooves 56 cut in the periphery of the hub and out ofcontact withthe barrel 57 of the loose pulley 28 and so that the pulleymay freely revolve on the shaft under normal conditions but when the huband sleeve are moved relatively to each other the rollers will be cammedup against the barrel of the pulley 28 to clutch or look the shaft andpulley together to drive the former.

tent or clutch-lever 61 mounted on a rock- The sleeve 5 l of the. clutchtumbler is provided with an eccentric enlargement or head provided witha laterally opening recess to receive a coiled spring 59 which isattached at itsends to the head58 of the tumbler and to the flange 52 ofthe hub 50,

respectively, and the head is provided with a stop-tooth 60 which isengaged by a deshaft 62 journaled in hearings in the head and in one ofthe brackets 27. When the detent is in engagement with the stop-tooth60, the spring 59 is expanded and the parts 50 and 54 are so relatedthat the rollers 55 lie in'the grooves 56 and'do not act on the barrelei of the pulley 28; when the detent is'withdrawn the pulling force ofthe spring moves the sleeve eta'round on the hub J I 50 and; this forcesthe rollers 55 into engagement with the barrel 57 and hub 50 to clutchthese parts together to revolve the 1, shaft to which the hub issplined. When the detent returns into engagement with the stop 60thetumbler 54: stops and the momentum of the machine expands the spring59 to restore its tension.

A supporting arm 63 is bolted to the table 21 and at its outer end isbent or curved upwardly'as at 6A and extended forwardly in line with thetack nozzle 36, terminating slightly in the rear thereof, all as clearlyshown in Figs. 1 and 2. This arm carries a. gage-slide 65 mounted insuitable guides 66 "and held in its forward position shown in Fig. 3 bya spring 67 secured at its ends to the slide and head, respectively. Therear end of the arm 63 is provided with a .pair of front and rear postsor uprights 68 and 69, the post 68 having a spring 70 coiled about itand the post 69 having a collar 71' secured to it. A sliding block 72 isprovided with elongated slots to receive the posts and is supported insliding and pivotal position thereon by the spring and collar in linewith the slide 65. The block 72 carriesa lateral pin 7 which engages anelongated slot 74L in an angularly depending arm 75 fast on the shaft 62so that as the block moves rearwardly under the impulse of the slide 65it will rock the shaft to withdraw the detent'Gl from the stop-tooth andas it moves 'forwardly under the pull of its spring 7 6 will returnthedetent into the path of the tooth, the spring 76 being secured at oneend to the post 68 to. return the block to its-normal forward position.The arm 63 is provided with a depending bracket 77 which carries anupright 7 8 made hollow at its upper end to receive a coil spring 79and'a movable post 80 resting on the spring and carrying ananti-friction roller 81 at its upperend in the path .of the cam 46. Thepost 80 carries a lateral pin 82 which takes over and engages the frontend of the block 72 to depress its front end to tilt the block the solein order to be-tacked to it.

as shown in Fig. 6 when the post is depressed against the tension of itsspring 7 9 by the cam. 1 The forward end of the slide carries a pin 83which engages an adjustable set-screw 84- in the arm 63 to vary theextent of its movement, and also a curved wing or gage 85 in the line oftacks and against which the work is pressed, and its rear end is beveledas at 86in order to allow the front end of the block to freely moveunder it and return to with it.

In using the machine the operator 18 rejquired to press the last andmaterial against the gage or plate in order to operat-e'the machine."Nhen pressure is thus applied to the gage 85 the slide65 is pushedrearwardly and pushes the block 7 2 in the same direction so that pin 73turns shaft 62 to throw the idetent 6l out of the path of the stop 60.The spring 59 now moves the sleeve 54: and forces the rollers 55 out ofthe grooves 56 5of the hub 50 and clutches the hub and pulley togetherto revolve the shaft 25. As

the shaft 25 revolves in the direction of the arrow in Figs. 3 and 9 itscam 46 begins to raise the arms 45 which rested in the depression 46 inthe face of the cam, and places the sprlng 44 under tension; when thecam completes about onehalf of a rev- ;olution it begins to act onroller 81 to depress the post 80 and front end of the block 7 2 when thespring 76 pulls theifront end of the block under the bevel 86 as shownin Fig. 6 which movement allows the arm to rock back to positionv toagain throw the detent into the path of revolving stop. tinuedrevolution of the shaft operates the tack-separator and allows the arm45 to drop [off into the recess A6 when the spring 4A 'operat es thedriving-lever and driver to The condrive the tack. When that is done thestop 60 comes against the detent 61 and the parts are restored to theposition of Fig. 9. By this means the clutch cannot be tripped oroperated and the machine cannot make its stroke unless the'operatorexerts a pressure on the slide 65, and as he exerts this pressure byapplying the last and its material to the gage or wing 85 be necessarilycrowds the material upon the last as the last is presented withitsbottom or sole to the tack enables the spring 7 6 to move the blockto position in alinement Z r stop the machine, even if the pressure onthe slide be maintained, so that the operator cannot cause a secondstroke even if he fails to promptly remove the pressure of the last. henthe pressure is taken 01? the slide 65 its spring 67 draws it forward sothat the block 7 2 can return to position; the tension of spring 67 maybe varied to require different degrees of pressure to operate themachine, and the gage or wing of the slide may be variably positionedwith respect to the tack-nozzle by a stop 87 on the slide engaging oneof the guides 66 and adjusted by any suitable means such as the slot 88and bolt 89 with the slide. By employing means requiring the pressure ofthe shoelast in the hand of the operator upon the gage-plate or wing tostart the machine the operator necessarily must crowd the material toits place on the last; by having an automatic throw off or stop-devicethe machine can make but a single stroke until this pressure is removedand the parts have returned to normal position.

It is obvious that the machine may be used as a gang-tacker by causingthe drivinglever to drive a plurality of tack-drivers or drivingbars byduplicating these latter parts and their associated accessories. Also,various forms of clutch may be employed, and the details of the startingand stopping mechanisms may be varied without depart ing from the scopeof my invention.

I claim 1. In a machine of the class described, tack-driving mechanism,a power shaft therefor, a clutch to couple and uncouple the same,clutch-operating mechanism comprising a pair of movable elements havinga slip-joint and adapted to be moved to couple the clutch by themovement of the shoe-material into the line of the tack-nozzle,cam-actuated means to move one of the elements to break the joint withthe other, and a spring to retract said camactuated element to uncouplethe clutch.

2. In a shoe-tacking machine, tack-driving mechanism, a power shafttherefor, a clutch to couple and uncouple the same,

clutch-operating mechanism comprising a movable slide and a pivotedsliding block having a slipjoint and adapted to be moved together in onedirection to couple the clutch by the pressure of the shoe-materialthereon when the latter is moved into the line of the tack-nozzle, aspring for the block, cam-actuated means to move the block to break thejoint between the slide and block, and a spring to reversely move theblock to uncouple the clutch.

3. A shoe-tacking machine, tack-driving mechanism, a power shaft havingan actuating cam therefor, a clutch to couple and uncouple the same, aclutch-controlling element, at rock-shaft carrying said element, a slidenormally in the line of the tack-nozzle and adapted to be moved by themovement of the shoe material into position to receive the tacks, a pairof posts in rear of the slide, a block slidably and pivotally supportedon the posts normally in the path of the slide, a pin on the block, anarm on the rock shaft having a slot for the pin, a post in the path ofthe cam having a pin to move the block on its pivot, and means to returnthe block to normal position.

at. In a shoe-tacking machine, tack-driving mechanism, a power shafthaving an actuating cam therefor, a clutch to couple and uncouple thesame, a detent to control the clutch, a rock-shaft carrying the detent,a slide and block having a slip-joint and adapted to be moved togetherin one direction by the movement of the shoe-material into position tobe tacked, posts on which the block is slidably and pivotally mounted,an arm on the rock-shaft having a pin and slot connection with theblock, a post in the path of the cam to move the block on its pivot, andsprings to return the slide and block to normal position when pressureis removed from the slide.

In testimony whereof I afi iX my signature in presence of two witnesses.

VALENTINE HOFFMAN.

Witnesses:

J. McRoBEnrs, H. 0. Low.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of I'atents, Washington, D. C.

